The Mophie Essentials Powerstation 20K features a built-in 20,000 mAh battery that allows for up to 4 full phone charges. The power station has an LED status indicator that shows how charged it is. Thanks to the USB-C input/output port and dual USB-A ports, you can charge up to three devices simultaneously. Use the USB-C port to recharge the power station in record time, or use the same port to charge a device. We also offer a two-year warranty on the Powerstation 20K, so you can have peace of mind.